aosong,dht

Vendor: Guangzhou Aosong Electronic Co., Ltd.

Description

Aosong DHT (Digital-output Humidity and Temperature Sensor)

The Aosong DHT family of sensors provide temperature and humidity
measurements through a bidirectional serial digital signal.  The
DHT11 uses a polymer humidity capacitor with NTC thermistor; the
DHT22 replaces the thermistor with a DS18B20 1-wire thermometer.

The DHT22 is also known as an AM2303.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

dio-gpios

phandle-array

Pin on which sensor communication will be performed.

Control and data are encoded by the duration of active low
signals.  A pull up may be appropriate.

This property is required.

dht22

boolean

Set to identify sensor as a DHT22/AM2303.  Leave unset to identify
sensor as a DHT11.

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “aosong,dht” compatible.

Name	Type	Details
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg`	`array`	register space See Important properties for more information.
`reg-names`	`string-array`	name of each register space
`interrupts`	`array`	interrupts for device See Important properties for more information.
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) See Important properties for more information.
`clocks`	`phandle-array`	Clock gate information
`clock-names`	`string-array`	name of each clock
`#address-cells`	`int`	number of address cells in reg property
`#size-cells`	`int`	number of size cells in reg property
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`mboxes`	`phandle-array`	mailbox / IPM channels specifiers
`mbox-names`	`string-array`	Provided names of mailbox / IPM channel specifiers
`wakeup-source`	`boolean`	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.